With the increasing popularity of Korean idols in Thailand, it has become a trend among teenagers to follow their fashion, hair, and makeup. Korean Wave or Hallyu idols have become the object of envy of fans, and it is easy to find the behavioral trends of teenagers trying to imitate and follow their idols. The purpose of this research is to explore the make-up behavior of Thai female fans influenced by BLACKPINK and analyze the reasons and motivations in following the make-up behavior of their idol. The Attitude/Motivation Test Battery (AMTB), developed by Gardner (1985), was used for measuring the degree of attitude and motivation of fans behavior. Through this study, the following conclusion can be drawn. First, the influence of BLACKPINK’s make-up style on Thai female fans is at a high degree. Fans can form identity, can create confidence and can make friends when they have imitated BLACKPINK’s make-up behavior. Second, the results demonstrate that the high level of the influence from BLACKPINK’s fans due to their attitude to beloved idols is always good.